TCXO, stable, low BER. Note: This is NOT a completed or assembled Hotspot, it is just MMDVM Board with Aluminum case. Support 3B, Pi ZERO, compatible with for NanoPi NEO, Orange Pi, compatible with BlueDV (requires USBtoTTL or Bluetooth model) Support VHF/UHF, frequency range: 144MHz-148MHz, 420MHz-475MHz, 842MHz-950MHz (depending on ADF7021 and TCXO, HAT firmware amateur radio brand license restrictions) Support MMDVM mode / / P25 / NXDN / DSTAR / POCSAG color:As shown :Plastic + Metal Package Contents: 1 x MMDVM motherboard (UHF&VHF) 1 x OLED display (soldered on the motherboard) 1 x black aluminum case (with mounting screws and cylinders) (Due to different batches, the appearance of the product may be different, it does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.